In his apartment building in the city, Sam hears all kinds of noises coming from behind closed doors---voices, a dog barking, a loud TV, snoring, even crunching potato chips. But one rainy day he hears the sad sounds of a harmonica. “ Who’s that playing?” he wonders. Sam’s search leads him to the dark and mysterious Apt.3, where he finds not only the source of the music---but a new friend.